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Changes in root architecture involving drought tolerance in oats

AuthorsCanales, Francisco José; Nagel, Kerstin; Fiorani, Fabio; Rispail, Nicolas ; Prats, Elena
Issue Date2017
PublisherInstitute of Field and Vegetable Crops
CitationCOSTWG1 / EPPN2020 workshop: 119 (2017)
AbstractDrought is one of the major environmental factors determining plant yield. Tolerance to this abiotic stress is a complex phenomenon comprising a number of physio-biochemical processes and also root architecture changes. Our aim is to reveal the morphological changes occurring within the roots that promote drought tolerance in oat. To this aim we employed two oat genotypes, Flega and Patones, previously characterized as highly susceptible and tolerant to drought respectively. Root phenotyping was carried out in both, pots by using destructive techniques, and in intact plants by using rhizotrons. In pots experiments, sampling times were chosen to cover different levels of sRWC: still-sufficient water (8 daww, 55-60% sRWC), mild water deficit (11 daww, 40-45% sRWC), moderate water deficit (14 daww, 30- 35% sRWC), high water deficit (17 daww, 20-25% sRWC), and severe water deficit (20 daww; 15-20% sRWC). For the rhizotron study, samples were grown at 90%, 35% and 20% of sRWC during whole experiment. In pots, tolerant genotype maintained similar growth respect its control under drought, and produced high number of roots with less than 0.5 mm of diameter. Rhizotron experiments confirmed these results and highlighted parameters like convex hull area and root system width, where susceptible and tolerant genotypes showed significant differences at 20% of sRWC. This work reveal that early and fine modulated morphological root changes are key factors for promoting drought tolerance in oats.
DescriptionTrabajo presentado en COSTWG1 / EPPN2020 workshop, celebrado en Novi Sad (Serbia) el 29 y 30 de septiembre de 2017.
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